Recent research and development in cardiac magnetic resonance imaging (MRI) has shown that a single exam, performed entirely in an MR scanner, might well replace the current sequence of tests for coronary disease. Though an MR scanner is expensive, the ability to consolidate diagnostic tests into a single session would significantly reduce costs and increase convenience for the patient. MRI might ...
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Non-uniform rational B-splines (NURBS) have become a de-facto industry standard primarily because they offer a unified mathematical form for representing both freeform shapes and analytical curves or surfaces. Despite these advantages, designers need software that lets them work with NURBS in a natural way. The paper presents a unified approach to NURBS shape modification that builds on a perspect...
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A new hybrid approach is presented which outperforms the regular grid technique in scenes with highly irregular object distributions by a factor of hundreds, and combined with an area interpolator, by a factor of thousands. Much has been said about scene independence of different acceleration techniques and the alleged superiority of one approach over another. Several theoretical and practical stu...
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When designing an algorithm for circle drawing, W.E. Wright (ibid., vol. 10, no. 5, pp. 60-7, Sept. 1990) chose to divide the circle into equal sub-arcs for rendering by separate processors. This method is simple and computationally tractable. Also, compared with the sequential algorithm, Wright's parallel circle-drawing algorithm achieves a speedup of 90% of P, where P represents the number of pr...
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One of the fun aspects of non-Euclidean geometries is discovering how familiar shapes change under new rules. The new rules mean we have to think about distances differently than in the world Euclid described. The author looks at a couple of simple 2D geometries that obey different distance rules than those that Euclid described
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The visualization scientists at Mississippi State University, working with the computational oceanographers at the Naval Research Laboratory, designed and implemented an interactive, real-time visualization tool called cthru. The cthru system, which provides visualization in a virtual environment, gives researchers the ability to alter model parameters and communicate these changes to the ocean mo...
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For many years, the only practical way to display high-quality true-color images was on a computer having a graphics subsystem with at least 24 color planes. The high cost of color graphics devices with 24 planes led many users to choose 8-, 12-, or 16-plane systems. Unfortunately, using a system with fewer color planes sacrifices some color capabilities to save money. The paper discusses an innov...
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Are architectural reconstructions in computer graphics a helpful research tool, or just pretty pictures to allow undergraduates a chance to get the look and feel of a forgotten place? The paper discusses the application of CAD tools, virtual reality and the Internet to architectural reconstructions such as the Athenian Acropolis and Stonehenge
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Mapping from parameter space to texture space separates textures from objects, enabling control of textured images without modifying the object or texture. Although conceptually straightforward, γ-mapping turns out to be very useful in practical texture mapping implementation. It logically separates the texture from the object and makes the texture mapping process flexible and easier to use....
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In computer graphics, ray tracing produces realistic images of 3D scenes. Most work in the field has focused on modeling reflection to account for the interaction of light with different materials, deriving illumination algorithms to simulate light transport throughout the environment, and designing new optimization techniques. Additional work by (Cook et al., 1984) targeted simulation of depth of...
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Developers of graphics applications in medicine face unique challenges in working closely with physicians. They must understand both the technology they support and the limitations of the techniques they use. In this article, I describe the unique challenges facing application developers and review the significant techniques in terms of their strengths and weaknesses in particular applications. In...
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Aims & Scope

IEEE CG&A bridges the theory and practice of computer graphics. From specific algorithms to full system implementations, CG&A offers a unique combination of peer-reviewed feature articles and informal departments, including product announcements.